Parmotrema diffractaicum (Essl.) Hale

Phytologia 28: 335 (1974).

Basionym: Parmelia diffactaica Essl., Byrologist 75: 80 (1972).

 

Type locality: USA, Tennessee, Overton County, Cliff Springs, Phillips 308 (US - holotype, DUKE - isotype).

Description: Lichen. Thallus foliose. Upper surface sorediate submarginally; rhizinate to the margin below (Hale & Fletcher 1990: 27).

Algae: Trebouxioid green alga.

Chemistry: Atranorin, diffractaic acid, lichexanthon (in the medulla) (Hale & Fletcher 1990: 27).